R. L. Stine’s The Haunting Hour Season 1 Episode 15

When boy scout Pete (Uriah Shelton) welcomes his teenage sister Alice (Jodelle Ferland) home from boarding school, his best friend Reggie believes she is a witch. It is revealed that Alice met a beginner’s witch named Enid at her boarding school who told her she was cursed. Alice suspects that it is a Saired Curse. The Saired Curse is said to first start with misfortune, then steals wealth, then health, sanity, and finally life. At first, Alice and Pete suspect Reggie, since he is slightly jealous of Pete, but it ends up being William Merrit, an older boy scout who attempted to date Alice. After she read one of his love-notes out loud so he would leave her alone, he vowed revenge. After a short magical battle, he is turned into a toad.